CN-122009944-A - Intelligent control system for lifting electromagnetic chuck

CN122009944ACN 122009944 ACN122009944 ACN 122009944ACN-122009944-A

Abstract

The invention discloses an intelligent control system for a lifting electromagnetic chuck, which comprises a three-phase thyristor rectifier bridge, a sampling unit and a main controller, wherein the input end of the three-phase thyristor rectifier bridge is connected with a three-phase alternating current power supply, the output end of the three-phase thyristor rectifier bridge is connected with the lifting electromagnetic chuck through a switch S1 and a storage battery pack through a switch S2, and the storage battery pack is connected with the lifting electromagnetic chuck in series through an IGBT power switch Q1. The invention solves the technical problems of unreliable magnetism-preserving intervention, uncontrollable magnetic force, logic conflict risk, huge volume, storage battery maintenance deficiency and the like of the traditional discrete system, realizes the seamless switching between magnetism preservation and excitation, can realize the accurate magnetic force control under all working conditions and the intelligent maintenance of the full life cycle of the storage battery, and has the advantages of high safety, strong reliability, compact structure, low cost and the like.

Inventors

ZHAO ZHENGJUN
CAI SHENGKE
WANG ZHAOYUE

Assignees

上海共久电气有限公司

Dates

Publication Date: 20260512
Application Date: 20260402

Claims (10)

1. An intelligent control system for lifting an electromagnetic chuck, comprising: The input end of the three-phase thyristor rectifier bridge (REC) is connected with a three-phase alternating current power supply, the output end of the three-phase thyristor rectifier bridge is connected with a lifting electromagnetic chuck through a switch S1 and is connected with a storage battery pack through a switch S2, and the storage battery pack is connected with the lifting electromagnetic chuck in series through an IGBT power switch Q1; The sampling unit comprises a voltage/current sensor arranged at the output end of the REC, a voltage/current sensor arranged at the front end of the lifting electromagnetic chuck, a voltage sensor arranged at the positive electrode and the negative electrode of the storage battery pack and a weight sensor arranged on the lifting electromagnetic chuck lifting ring; and the Main Controller (MCU) is used for receiving the feedback signal of the sampling unit, calculating the control quantity of the REC or the Q1 according to a PID closed-loop control algorithm formula, and controlling the on-off states of the REC, the S1, the S2 and the Q1 according to a time-division multiplexing rule.
2. The intelligent control system according to claim 1, wherein the three-phase thyristor rectifier bridge is composed of six thyristors, and is divided into a common cathode group and a common anode group for rectifying three-phase alternating current into direct current.
3. The intelligent control system according to claim 1, wherein the main controller calculates a target current value according to a weight signal fed back by the weight sensor, and calculates a control amount by combining the current feedback signal and a general PID closed loop control algorithm formula, wherein the control amount is used for adjusting a thyristor conduction angle of the REC or a PWM duty ratio of the IGBT power switch.
4. The intelligent control system according to claim 1, wherein the time-division multiplexing rule is set as follows: ① Normal mode The magnetic attraction command is provided, the three-phase power supply of the external network is normal, and the REC is controlled to be opened, the Q1 is closed, the S1 is closed, and the S2 is opened, so that the REC is output to the lifting electromagnetic chuck; ② Mode of magnetism-keeping throw-in The magnetic attraction command is provided, but the three-phase power supply of the external network fails, and REC is controlled to be closed, Q1 is controlled to be opened, S1 is controlled to be closed, S2 is controlled to be closed, so that the storage battery pack is output to the lifting electromagnetic chuck; ③ Charging mode The method comprises the steps that no magnetic attraction command is generated, and the storage battery pack is in power failure, and REC is controlled to be opened, Q1 is controlled to be closed, S1 is controlled to be opened, S2 is controlled to be closed, so that REC is output to charge the storage battery pack; ④ Storage battery pack discharge maintenance mode When the electricity is not discharged after the long expiration of the monitoring storage battery pack, the REC is controlled to be closed, the Q1 is opened, the S1 is closed and the S2 is closed, so that the storage battery pack is output to the lifting electromagnetic chuck, when the capacity of the monitoring storage battery pack is reduced to a set threshold value, the REC is controlled to be opened, the Q1 is closed, the S1 is closed and the S2 is opened, so that the REC is output to the lifting electromagnetic chuck, and when the magnetic attraction command disappears, the Q1 is controlled to be closed, the S1 is opened and the S2 is closed, so that the REC is output to the storage battery pack for charging.
5. The intelligent control system according to claim 4, wherein the fault of the external network three-phase power supply is when one or more of voltage drop, phase sequence error and zero-crossing signal are indicated.
6. The intelligent control system according to claim 4, wherein the charging mode comprises three stages of constant current charging, constant voltage charging and floating charging, and the MCU dynamically adjusts the thyristor conduction angle of REC according to the current voltage of the storage battery pack so as to switch between the different charging stages.
7. The intelligent control system according to any one of claims 1 to 6, further comprising a battery pack health management module for monitoring changes in discharge current and voltage of the battery pack during magnetic flux maintenance, evaluating health status, calculating current actual capacity and available maximum magnetic flux maintenance time, and prompting replacement of the battery pack when remaining magnetic flux maintenance time is less than a safety threshold.
8. The intelligent control system according to claim 7, further comprising a crane band-type brake control subsystem comprising a BOOST circuit and an IGBT inverter module connected to the rear end of the battery pack for inverting the battery pack voltage into three-phase alternating current.
9. The intelligent control system according to claim 8, wherein the BOOST circuit comprises an inductor L, IGBT, a diode D3 and a capacitor C3, the inductor L is connected in series with the positive electrode of the storage battery, the IGBT power switch Q2 is connected between the inductor L and the negative electrode of the storage battery, the anode of the diode D3 is connected with the connection point of the inductor L and the IGBT power switch Q2, the cathode of the diode D3 is connected with the positive electrode of the capacitor C3, and the capacitor C3 is connected with two ends of the DC bus in parallel.
10. The intelligent control system according to claim 8, wherein the IGBT inverter module is a three-phase full-bridge inverter, three half-bridge units are formed by 6 IGBTs, the DC bus ends of the three half-bridge units are connected between the positive electrode and the negative electrode of the capacitor C3 in parallel, and the output ends of the three half-bridge units respectively form R-phase, S-phase and T-phase alternating current outputs.

Description

Intelligent control system for lifting electromagnetic chuck Technical Field The invention relates to an intelligent control system for a lifting electromagnetic chuck, and belongs to the technical field of industrial control. Background The lifting electromagnetic chuck (also called lifting electromagnet and electromagnetic chuck lifting tool) is a core component of industrial lifting equipment for lifting magnetic material workpieces such as steel and the like by utilizing the electromagnetic principle to generate strong adsorption force. The material transporting device is generally arranged on a crane, an excavator or a forklift, replaces the traditional sling to realize efficient and safe material transporting, and is widely applied to industries such as metallurgy, mines, factories and the like. However, the existing control system for lifting the electromagnetic chuck has the following technical defects: Firstly, in the prior art, two independent systems are generally adopted to respectively realize excitation control and power-down magnetic-retaining control of the lifting electromagnetic chuck, and the two systems are cooperated with each other through electric connection or bus communication; the system architecture has the problem that the magnetic conservation intervention is unreliable, because the triggering of the magnetic conservation action depends on the reliability of external communication or electrical connection, when the risks of signal loss, delay or logic conflict exist, hundred percent of the magnetic conservation investment cannot be ensured when a power supply fails, and potential safety hazards exist; Secondly, the existing magnetism-preserving system only directly applies the voltage of the storage battery to the electromagnetic chuck, and cannot realize current regulation, so that the magnetic force cannot be regulated according to the characteristics of materials in a magnetism-preserving state, and the magnetic force is too large to possibly deform finished products such as thin steel plates, and the risk of dropping the materials exists when the magnetic force is too small; Thirdly, the existing discrete systems respectively comprise a controller and a power component, the whole occupied volume is large, upgrading and transformation are difficult to finish on a crane beam with limited space, and the purchase cost of the two discrete systems is high; Fourth, the storage battery pack is used as a key component of the magnetism-keeping system, and only participates in working when power failure and magnetism keeping occur randomly, and the storage battery pack can be in a full-power standby state for a long time without a discharging circulation process. Disclosure of Invention Aiming at the problems existing in the prior art, the invention aims to provide an intelligent control system for the lifting electromagnetic chuck, which can realize seamless switching of excitation and magnetism retention, can realize accurate adjustment of magnetic force under all working conditions and can realize intelligent maintenance of the whole life cycle of a storage battery. In order to achieve the aim of the invention, the invention adopts the following technical scheme: an intelligent control system for lifting an electromagnetic chuck, comprising: The input end of the three-phase thyristor rectifier bridge (REC) is connected with a three-phase alternating current power supply, the output end of the three-phase thyristor rectifier bridge is connected with a lifting electromagnetic chuck through a switch S1 and is connected with a storage battery pack through a switch S2, and the storage battery pack is connected with the lifting electromagnetic chuck in series through an IGBT power switch Q1; The sampling unit comprises a voltage/current sensor arranged at the output end of the REC, a voltage/current sensor arranged at the front end of the lifting electromagnetic chuck, a voltage sensor arranged at the positive electrode and the negative electrode of the storage battery pack and a weight sensor arranged on the lifting electromagnetic chuck lifting ring; and the Main Controller (MCU) is used for receiving the feedback signal of the sampling unit, calculating the control quantity of the REC or the Q1 according to a PID closed-loop control algorithm formula, and controlling the on-off states of the REC, the S1, the S2 and the Q1 according to a time-division multiplexing rule. In one embodiment, the three-phase thyristor rectifier bridge is composed of six thyristors, and is divided into a common cathode group and a common anode group for rectifying three-phase alternating current into direct current. In one implementation, the master controller calculates a target current value according to a weight signal fed back by the weight sensor, and calculates a control quantity according to a current feedback signal and a general PID closed-loop control algorithm formula, wherein the control quantity